A bakery makes angel food cupcakes and chiffon cupcakes using two common ingredients: sugar and flour. A box of angel food cupcakes requires 8 cups of sugar and 4 cups of flour and sells for $21 per box. A box of chiffon cupcakes requires 4 cups of sugar and 9 cups of flour and sells for $10 per box. The bakery has 234 cups of sugar and 220 cups of flour on hand on a certain day. How many boxes of each product should the bakery make that day to maximize its profit?